NDLI: Productivity of greengram in tebuconazole-stressed soil, by using a tolerant and plant growth-promoting Bradyrhizobium sp. MRM6 strain

Content Provider	Springer Nature Link
Author	Ahemad, Munees Khan, Mohammad Saghir
Copyright Year	2011
Abstract	In this study, a total of 50 rhizobial isolates were recovered from the root nodules of greengram plants. Of the 50 isolates, 9 bradyrhizobial strains namely, MRM1, MRM2, MRM3, MRM4, MRM5, MRM6, MRM7, MRM8, and MRM9, exhibiting a higher tolerance levels of 600, 800, 1,200, 1,000, 1,000, 1,600, 1,400, 1,400, and 1,000 μg ml$^{−1}$, respectively, to triazole fungicide tebuconazole (chromatographically pure) were selected and tested for plant growth-promoting activities. Generally, the rhizobial strain with maximum fungicide-tolerance ability produced higher amounts of plant growth-promoting substances. Among the nine bacterial strains, Bradyrhizobium strain MRM6 was preferably selected due to its ability to tolerate tebuconazole maximally (up to 1,600 μg ml$^{−1}$) on minimal salt agar medium. In addition, the strain MRM6 grew well in minimal salts medium supplemented with 100 (recommended), 200 (two times of the recommended), and 300 μg tebuconazole l$^{−1}$ (three times of the recommended rate) and synthesized highest amounts of plant growth-promoting substances like indole acetic acid, siderophores, exopolysaccharides, hydrogen cyanate, and ammonia, both in the absence and presence of 100, 200, and 300 μg l$^{−1}$ of tebuconazole. Following these properties, the strain MRM6 was used as inoculant and the inoculated greengram plants was raised in soils treated separately with recommended, two and three times the recommended dose of tebuconazole. Generally, tebuconazole at recommended and the higher rates decreased biomass, nodulation, nutrient-uptake, and grain yield of uninoculated greengram plants. Interestingly, Bradyrhizobium sp. (vigna) strain MRM6 when used with any concentration of tebuconazole, significantly increased the measured phyto-chemical-parameters of greengram plants when compared with those grown in soils treated exclusively (without inoculant) with tebuconazole. This study inferred that the strain MRM6 of Bradyrhizobium sp. (vigna) was compatible with tebuconazole and may be co-inoculated with this fungicide for enhancing the production of legumes especially greengram in soils poisoned with fungicides.
Starting Page	245
Ending Page	254
Page Count	10
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	34
Issue Number	1
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-08-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bradyrhizobium Fungicide Greengram Tebuconazole tolerance Plant Biochemistry Plant Physiology Plant Anatomy/Development Plant Pathology Agriculture Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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